Add ability to insert an additional location block & custom configuration

[khaliqgant]

• Additional location block use case is to add in an additional header in my case a websockets location:

metadata:
    annotations:
      location_block_header: "subscriptions/"

• Allow for other ssl protocols and ciphers
• Custom security header support and proxy-headers and in the above use case upgrade-protocol-headers

  security-headers.conf: |-
    server_tokens off;
    proxy_hide_header X-Powered-By;
  proxy-headers.conf: |-
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header Host $http_host;
    proxy_set_header X-NginX-Proxy true;
  upgrade-protocol-headers.conf: |-
    proxy_set_header Host $http_host;
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  nginx.conf: |-

[andrii-lundiak]

So, @khaliqgant it's 2021, so what the idea of maintaining this @kylemcc repo? Kyle are you there? Is this PR looks OK to you?